Add the code-gemma models. (#2038)

* Add the code-gemma models.

* Tweak to the gemma config.

candle-examples/examples/gemma/main.rs

@@ -30,6 +30,14 @@ enum Which {
     InstructV1_1_2B,
     #[value(name = "1.1-7b-it")]
     InstructV1_1_7B,
+    #[value(name = "code-2b")]
+    CodeBase2B,
+    #[value(name = "code-7b")]
+    CodeBase7B,
+    #[value(name = "code-2b-it")]
+    CodeInstruct2B,
+    #[value(name = "code-7b-it")]
+    CodeInstruct7B,
 }
 
 struct TextGeneration {
@@ -224,6 +232,10 @@ fn main() -> Result<()> {
             Which::Base7B => "google/gemma-7b".to_string(),
             Which::Instruct2B => "google/gemma-2b-it".to_string(),
             Which::Instruct7B => "google/gemma-7b-it".to_string(),
+            Which::CodeBase2B => "google/codegemma-2b".to_string(),
+            Which::CodeBase7B => "google/codegemma-7b".to_string(),
+            Which::CodeInstruct2B => "google/codegemma-2b-it".to_string(),
+            Which::CodeInstruct7B => "google/codegemma-7b-it".to_string(),
         },
     };
     let repo = api.repo(Repo::with_revision(

candle-transformers/src/models/gemma.rs

@@ -1,7 +1,7 @@
 use std::sync::Arc;
 
 use candle::{DType, Device, Module, Result, Tensor, D};
-use candle_nn::{linear_b as linear, Linear, VarBuilder};
+use candle_nn::{linear_b as linear, Activation, Linear, VarBuilder};
 
 fn default_max_position_embeddings() -> usize {
     4096
@@ -11,8 +11,9 @@ fn default_max_position_embeddings() -> usize {
 pub struct Config {
     pub attention_bias: bool,
     pub head_dim: usize,
-    #[serde(alias = "hidden_activation")]
-    pub hidden_act: candle_nn::Activation,
+    // The code gemma configs include both hidden_act and hidden_activation.
+    pub hidden_act: Option<Activation>,
+    pub hidden_activation: Option<Activation>,
     pub hidden_size: usize,
     pub intermediate_size: usize,
     pub num_attention_heads: usize,
@@ -26,6 +27,16 @@ pub struct Config {
     pub max_position_embeddings: usize,
 }
 
+impl Config {
+    fn hidden_act(&self) -> Result<Activation> {
+        match (self.hidden_act, self.hidden_activation) {
+            (None, Some(act)) | (Some(act), None) => Ok(act),
+            (Some(_), Some(_)) => candle::bail!("both hidden_act and hidden_activation are set"),
+            (None, None) => candle::bail!("none of hidden_act and hidden_activation are set"),
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 struct RmsNorm {
     weight: Tensor,
@@ -127,7 +138,7 @@ impl MLP {
             gate_proj,
             up_proj,
             down_proj,
-            act_fn: cfg.hidden_act,
+            act_fn: cfg.hidden_act()?,
         })
     }
 }